Branched Aortic Arch Study

Inclusion Criteria: * Aneurysm of the aortic arch larger than 6cm in diameter, or symptomatic aneurysm of the aortic arch, of any diameter, or any arch aneurysm with a 2-year rupture rate estimated to be more than 20%. * Anticipated mortality rate with open repair estimated to be more than 20%. * Suitable arterial anatomy for stent-graft * Life expectancy more than 2 years * Ability to give informed consent and willingness to comply with follow-up schedule Exclusion Criteria: * Free rupture of the aneurysm * Pregnancy * Anaphylactic reaction to contrast material * Allergy to stainless steel or polyester * Unwillingness or inability to comply with the follow-up schedule * Serious systemic or groin infection * Uncorrectable coagulopathy * Significant presence of carotid artery atherosclerosis * Arrhythmia define as 2nd- and 3rd-degree atrioventricular block or sinus node disease, such as sick sinus syndrome and symptomatic bradycardia, unless the patient already has a pacemaker in place and cardiology consultation confirms that it is safe to proceed.